Abstract
Length and support mode are the key to restrict the ultrasonic motor miniaturization. This paper presents a miniature langevin-type ultrasonic motor stator, it has both short length and simple support mode. With fixed-free ends, the stator adopts a square base and is fixed at its four corners. A new excitation mode is utilized to solve the problem of insistence of excitation position in the conventional excitation mode. Since the stator is unsymmetrical along the circumferential direction, there should be an optimal excitation angle. By using finite element method, axial displacement and radial displacement of nodes are achieved along the outer edge of the upper end of the stator when excitation angle is changed , then the results are analyzed and the conclusion can be reached that 45o is the optimal excitation angle. Finally, a photo of the stator prototype is presented.
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